{"uid":"cap_Iuh9E8n3cvAtaKZniirsm","slug":"imgnai-katana-gpt-5-5-chat-api-abc1c502","name":"imgnAI Katana GPT-5.5 Chat API","description":"Pay-per-call AI gateway: Frontier/SOTA LLM, Image, and Video models - and proprietary low-cost imgnAI models. Includes GPT 5.5, Opus 4.8, GPT Image 2, Nano Banana 2, Seedance 2.0, Happy Horse, and Google Omni. Fully compatible with OpenAPI, HermesOS, and OpenClaw.","url":"https://kat.imgnai.com/v1/text/chat-gpt-55?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["messages"],"properties":{"messages":{"type":"array"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.052","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":1,"rating":{"score":"0.08","successRate":"0.00","reviews":1,"stars":"1.3","state":"rated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.052/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.052","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.052","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_04Z_xEeY-MuHWMyKOZFz1","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.052","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Pay-per-call chat completion endpoint powered by GPT-5.5 via the imgnAI Katana AI gateway","exampleAgentPrompt":"Using the Katana gateway's GPT-5.5 endpoint, send this conversation — system: 'You are a helpful assistant', user: 'Explain the difference between supervised and unsupervised learning in 3 sentences' — with a max of 300 tokens and temperature 0.7.","exampleUseCases":null,"resultDescription":"Returns an OpenAI-compatible chat completion object containing an array of choices (each with a message and finish reason) and a usage object detailing prompt tokens, completion tokens, and total tokens consumed.","failureModes":["Insufficient USDC balance or failed x402 payment results in 402 Payment Required","Invalid or missing messages array returns 400 Bad Request","Model overload or upstream GPT-5.5 unavailability returns 503 Service Unavailable","Malformed temperature or max_tokens values return validation errors","Streaming connection drops mid-response if network is unstable"],"whenToPreferThis":"Choose this endpoint when you need GPT-5.5 quality responses on a pay-per-call basis without an OpenAI subscription, especially in agentic workflows using USDC micropayments via the x402 protocol. It is ideal for cost-controlled, sporadic LLM calls where you only pay per invocation at $0.05425 USDC.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":1,"lastUsedAt":"2026-07-17T22:38:14.202Z","lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T20:32:03.024Z","isFirstParty":false,"canonicalSlug":"imgnai-katana-gpt-5-5-chat-api-abc1c502"}